Cane mill



Jan. 1, 1929. 1,696,945

F. FARREL, JR

CCCCCC LL 2 Sheets-Sheet l Jan. 1, 1929. 1,6965945 v 'RREL, JR

, alibi 11 I u Patented Jan. 1, 1929.

NEE STATES rArENr orrics.

FRANKLIN FARREL, JR., OF NEW HAVEN,

CONNECTICUT, Assrenon, BY MESNE AS- SIGNMENTS, TO FARREL-BIRMINGHAM COMPANY, INCORPORATED, OF ANSONIA, CONNECTICUT, A CORPORATION OF GONNEGTICUT.

CANE

Application filed June 28, 1924, Serial This invention relates to cane grinding machinery, such as employed for the extraction of juice from sugar cane. The inven tion is particularly concerned with mills or grinding apparatus of the general type set forth in my prior application, Serial No. 145,527 filed February 16, 1921.

One of the primary objects of my invention is to increase the efficiency of the grinding or crushing of cane stalks.

Another object of my invention is to provide a machine in which the cane is preliminarily crushed and shredded more effectively than in former practice so that the stalks will be more thoroughly laid open and shredded or disintegrated and the fibres more thoroughly squeezed orpressed for removing the juice therefrom.

To these and other ends the invention consists of the novel features and combination of parts to be hereinafter described and claimed.

in the accompany drawings:

Fig. 1 is a top plan view of a portion of a cane mill embodying my improvements;

Fig. 2 is a longitudinal section through the preliminary crusher rolls;

Fig. 3 is an enlarged fragmentary elevation showing the teeth of the crusher rollsof the lirst pair;

Fig. a is an enlarged horizontal section of portions of the crusher rolls of the first pair;

Fig. 5 is a view similar to Fig. 3, showing the teeth of the rolls of the second pair, and,

Fig. 6 is a view corresponding to Fig. 4, illustrating the tooth construction of the rolls of the second pair.

In the drawings I have illustrated a pair of preliminary crusher rolls 10, followed by a second pair of crusher rolls 11, that de liver the crushed cane to a juice expressing mill 12, such as the customary three-roll mill. lhe number of pairs of preliminary crushing rolls may be varied as desired, but in the particular form shown it is assumed that the raw cane as it comes from the field is delivered by .a suitable conveyor and chute (not shown) to the rolls 10. The cane is drawn in and crushed by the rolls 10 so asto split open the stalks and separate the fibres to some extent, and is then carried over suitable inclined runways (not shown) to the second crusher 11 and the threaten MILL.

No. 723,015. Renewed June 2c, 1928.

mill 12, which latter may or may not precede other similar juice expressing mills.

The rolls of the crushers 10 and 11 are provided with teeth for hooking or drawing in the cane so that the latter will be fed into and through the machine in a uniform and expeditious manner. In the embodiment shown, the rolls 10 are provided with a mu. rality of circumferential V-shaped grooves 13. This provides correspondingly shaped ridges or ribs, and the ribs of one roll of the pair enter the grooves of the other roll with a certain amount of clearance as shown in Fig. 4. The circumferential grooves 13 are intersected by generally longitudinal grooves 14, the result of which intersection is the formation of the teeth 15, as shown in Figs. 3 and 1. Each of the longitudinal grooves 14: has an abrupt side 16, a sloping side 17 and a rounded bottom 18, as shown in Fig. 3. While the grooves 14 are longitudinal in a general sense, they are preferably not exactly parallel to the axis of the roll; in fact,

it is considered the best practice to provide an obtuse angle in the lengthwise groove at about the center of the roll, as shown in Fig. 1. i

In the second crusher 11, the grooving in its general features is similar to that just described. Teeth 19 are formed by the provision of circumferential grooves 20 and longitudinal grooves 21. Itwill be noted, however, that whereas in the case of the rolls 10, the longitudinal and circumferential grooves are of substantially the same depth, the longitudinal grooves 21 of the second crusher are of substantially less depth than the circumferential grooves 20 thereof. In the first crusher, the circumferential grooves are, say, of an inch deeper than the longitudinal grooves in order to insure the scraper points of usual. construction (not shown) reaching fully to the bottoms of the longitudinal grooves and thereby cleaning the same out thoroughly. In the second crusher, however, where less hooking or drawing effect is necessary the longitudinal grooves 21 are only approximately one-third as deep as the circumferential grooves 20. In any case, the longitudinal grooves are substantially shallower than the circumferential grooves in the second crusher. This increases the s redding act-ion and the tuna expressing sifted is stalks .er rolls with sh alloav longitu din al.

supported in the shallow lengthwise grooves 21 at plurality of spaced points are carried by a sort of wiping motion down into relatively deep valleys of the second pair of crusher rolls by the circumferential ribs of said rolls. This wiping motion shreds the stalks to a. considerable degree and tears -t-he same apart, and the squeezing of the stalks in the valleys is also considerable.

It will be observed that the longitudinal grooves 21 of the second pair of crusher rolls 11 are spaced at a less distance from each other than are the longitudinal grooves i l of the first pair of crusher rolls. Thus there is a tendency-in this particular case to compensate for the relative shallowness of the grooves 21 .by increasing the number thereof .as compared with the longitudinal grooves of the first rolls. Nevertheless, in spite of the ofthe invention as defined by the claims.

I do not claim broadly herein a cane mill ,havinga pair of pro-crushing rolls provided with intersecting circumferential and longitudinal grooves of substantially the same depth, and second pair of pro-crushing rolls :having intersecting longitudinal and circumferential grooves whereof the circumferential grooves are substantially deeper than the longitudinal grooves, or other features claimed in myapplication. Serial No. 722,749, filed June 27, 1924.

lVhat I claim is:

1. In a-cane mill, a plurality of pairs .of crushing rolls, each andall of said rolls having circumferential ribs oft-he same pitch and each and .all of said rolls having longitudinal grooves intersecting the circumferential grooves and forming teeth, the longitudinal. grooves of a preceding .pa-ir being spaced farther apart than the longitudinal grooves of a succeeding pair, and the longitudinal grooves of the preceding pair being substantially the same depth as the circumferential grooves thereof, whereas in the other pair, the longitud-inal grooves are substsmtially shallower than the circumferential grooves.

' 2. In a cane mill, two pairs of preliminary crusher rolls, said rolls all having circumferential ribs of the same pitch, but the two pairs .of rolls having di erently spaced lengthwise grooves, one of said pairs of rolls having its lengthwise grooves sust-a-ntially shallower than its cire unferential groov s, and substantially shallower than the lengthwise grooves of the other pair.

3. In acane mill, two pairs of preliminary crusher rolls, both pairs of rolls having circumferential grooves and ribs, a preceding pair having widely spaced longitudinal grooves and a succeeding pair having less widely spaced longitudinal grooves, and the longitudinal grooves of the succeeding pair being substantially shallower than the circumferential grooves thereof.

4-. In a cane mill, two pairs of preliminary crusher rolls, both pairs of rolls having circumferential ribs of the same pitch, a preced ing pair having widely spaced longitudinal grooves and succeeding pair having less widely spaced longitudinal grooves, and there being a substantial difference in depth between .the circumferential grooves and the longitudinal grooves of the succeeding pair, the lengthwise grooves and the circumferential grooves of the first pair being of substantially the same depth. and the circumferentialgrooves of the second pair being at le st twice as deep as the lengthwise grooves thereof.

5. In a cane mill, a pair of crusher rolls having circumferential ribs-and grooves, and widely spaced longitudinal grooves, and a s cond pair of crusher rolls having circumferential i ihsand grooves and narrowlyspaced lon gitudinal grooves, said last named grooves being considerably shallower with respect to their intersecting circumferential grooves than int-he case of the first pair of rolls.

In witness whereof, I have hereunto set my hand this 26th day of June, T924.

FRANKLIN FAR-REL, Ju. 

